*HEADING
          TWO DIMENSIONAL HEAT TRANSFER INTERFACE  (C3D8RT)
          GAP RADIATION
**
** The temperature at the NOUT nodes, based on a 1D model, is:
** NT_out=100+HFL2*R_th; R_th=L/(kA);   
** See ch. 1.7.1 of ABAQUS/Verification Manual  
**
*PHYSICAL CONSTANTS,ABS=-460.,STEFAN=5.E-10
*NODE,NSET=NALL
      1,          10.,          -1.,           0.
      2,          11.,          -1.,           0.
      3,          11.,          -1.,           1.
      4,          10.,          -1.,           1.
      5,          11.,        -0.01,           0.
      6,          11.,        -0.01,           1.
      7,          10.,        -0.01,           1.
      8,          10.,        -0.01,           0.
      9,          11.,           0.,           0.
     10,          11.,           1.,           0.
     11,          11.,           1.,           1.
     12,          11.,           0.,           1.
     13,          10.,           1.,           0.
     14,          10.,           1.,           1.
     15,          10.,           0.,           1.
     16,          10.,           0.,           0.
*NSET, NSET=SIDE3
10,11,13,14
*NSET, NSET=BOT
1,2,3,4,5,6,7,8
*NSET,NSET=QA_TEST
9,12,15,16
*NSET,NSET=NOUT
QA_TEST,
*ELEMENT, TYPE=C3D8RT
1, 8, 5, 6, 7, 1, 2, 3, 4
*ELEMENT, TYPE=C3D8RT,ELSET=TOP
2, 16, 13, 14, 15,  9, 10, 11, 12
*ELSET, ELSET=SOLID
1,2,
*SOLID SECTION,ELSET=SOLID,MATERIAL=SOLMAT
*MATERIAL,NAME=SOLMAT
*CONDUCTIVITY
1., 
*SPECIFIC HEAT
46., 
*DENSITY
7850., 
*ELASTIC
1.0,0.0
*SURFACE,TYPE=ELEMENT, NAME=SURF3
2,S6
*SURFACE,TYPE=ELEMENT, NAME=SURF4
1,S1
*STEP
*DYNAMIC TEMPERATURE-DISPLACEMENT, EXPLICIT
 ,1000000.
*CONTACT PAIR, INTERACTION=GAP,WEIGHT=1.0
SURF3,SURF4
*SURFACE INTERACTION, NAME=GAP
*GAP RADIATION
1.0,1.0
1.0,0.0
1.0,10.0
*BOUNDARY,OP=NEW
SIDE3,11,,100.
BOT,11,,50.
******************************
*FILE OUTPUT, NUM=1
*NODE FILE,NSET=NOUT
 NT,
******************************
*OUTPUT,FIELD,NUM=1
*NODE OUTPUT,NSET=QA_TEST
NT
*NODE OUTPUT,NSET=NALL
NT
********************************
***OUTPUT, HISTORY,TIME INTERV=1E5
***NODE OUTPUT, NSET=NOUT
**NT, 
***ELEMENT OUTPUT, ELSET=TOP
**HFL2,
********
*OUTPUT, HISTORY,TIME INTERV=1.0E6
*ENERGY OUTPUT,VAR=ALL
*********
*ENDSTEP